IVRCompositor::WaitGetPoses

Returns pose(s) to use to render scene.

virtual void WaitGetPoses( VR_ARRAY_COUNT(unPoseArrayCount) TrackedDevicePose_t* pPoseArray, uint32_t unPoseArrayCount ) = 0;

For more information on poses, see IVRSystem::GetDeviceToAbsoluteTrackingPose.